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Dresden 2009 – scientific programme

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MA: Fachverband Magnetismus

MA 7: Spin-Dynamics/ Spin-Torque II

MA 7.12: Talk

Monday, March 23, 2009, 18:15–18:30, HSZ 04

Polarization selective switching of magnetic vortices with rotating currents — •Michael Martens1, Thomas Kamionka1, Markus Bolte1, Benjamin Krüger2, Kang Wei Chou3, Tolek Tyliszczak3, Michael Curcic4, Bartel Van Waeyenberge4, Hermann Stoll4, and Guido Meier11Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Germany — 2I. Institut für Theoretische Physik, Universität Hamburg, Germany — 3Advanced Light Source, LBNL, Berkeley, CA, USA — 4Max-Planck-Institut für Metallforschung, Stuttgart, Germany

Magnetic vortices in micron-sized disks and squares are interesting objects of research for understanding fundamental field- and current-induced magnetization dynamics and offer new concepts for data storage devices. The selective switching of the vortex-core polarization, i.e the out-of-plane component of the magnetization, by resonant excitation has been shown both theoretically [1] and experimentally [2]. Here we present our experiments on polarization reversal using rotating currents through a permalloy square. The frequency and power dependent excitation is measured systematically by means of time-resolved scanning transmission X-Ray microscopy (STXM). The phase of the gyration with respect to the exciting current yields information about the Oersted-field and the spin-torque driven contribution to the excitation. In addition we found experimental confirmation of halo-formation near the switching threshold.

[1] S. K. Kim et al., Appl. Phys. Lett. 92, 022509 (2008).

[2] M. Curcic et al., Phys. Rev. Lett. 101, 197204 (2008).

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